wesm commented on pull request #7506:
URL: https://github.com/apache/arrow/pull/7506#issuecomment-647649670
For curiosity, here are the same benchmarks on my laptop with gcc-8 (using
the new output formatting from ARROW-9201)
```
benchmark baseline
contender change % regression
46 CastUInt32ToInt32Safe/262144/1 994.591m items/sec 4.487b
items/sec 351.118 False
31 CastUInt32ToInt32Safe/32768/1 932.612m items/sec 3.622b
items/sec 288.383 False
52 CastInt64ToInt32Safe/262144/1 1.258b items/sec 3.393b
items/sec 169.693 False
38 CastInt64ToInt32Safe/32768/1 1.170b items/sec 2.703b
items/sec 130.930 False
26 CastUInt32ToInt32Safe/262144/1000 742.665m items/sec 1.217b
items/sec 63.901 False
54 CastUInt32ToInt32Safe/32768/1000 696.762m items/sec 1.132b
items/sec 62.468 False
43 CastDoubleToInt32Safe/262144/1 1.493b items/sec 2.333b
items/sec 56.229 False
66 CastDoubleToInt32Safe/32768/1 1.366b items/sec 2.001b
items/sec 46.571 False
61 CastInt64ToDoubleSafe/262144/1 1.489b items/sec 2.162b
items/sec 45.245 False
67 CastInt64ToDoubleSafe/32768/1 1.370b items/sec 1.854b
items/sec 35.316 False
5 CastUInt32ToInt32Safe/32768/2 204.642m items/sec 253.501m
items/sec 23.876 False
40 CastInt64ToDoubleSafe/262144/1000 802.584m items/sec 987.873m
items/sec 23.087 False
25 CastUInt32ToInt32Safe/32768/10 451.556m items/sec 546.766m
items/sec 21.085 False
24 CastDoubleToInt32Safe/262144/1000 744.363m items/sec 899.943m
items/sec 20.901 False
3 CastInt64ToDoubleSafe/32768/1000 753.040m items/sec 906.901m
items/sec 20.432 False
53 CastInt64ToInt32Safe/262144/1000 968.574m items/sec 1.158b
items/sec 19.578 False
49 CastDoubleToInt32Safe/32768/1000 697.915m items/sec 829.688m
items/sec 18.881 False
55 CastInt64ToInt32Safe/32768/1000 893.465m items/sec 1.051b
items/sec 17.641 False
57 CastInt64ToDoubleSafe/32768/2 215.963m items/sec 238.114m
items/sec 10.257 False
15 CastUInt32ToInt32Safe/262144/2 212.126m items/sec 232.094m
items/sec 9.414 False
12 CastInt64ToDoubleSafe/32768/10 443.363m items/sec 483.006m
items/sec 8.942 False
18 CastInt64ToInt32Safe/32768/2 219.356m items/sec 236.947m
items/sec 8.020 False
7 CastInt64ToDoubleSafe/262144/2 220.790m items/sec 225.300m
items/sec 2.043 False
69 CastInt64ToInt32Unsafe/32768/1000 3.262b items/sec 3.304b
items/sec 1.278 False
14 CastInt64ToInt32Unsafe/262144/0 4.271b items/sec 4.306b
items/sec 0.814 False
22 CastInt64ToInt32Unsafe/32768/2 3.272b items/sec 3.290b
items/sec 0.546 False
64 CastInt64ToInt32Safe/262144/2 228.532m items/sec 229.766m
items/sec 0.540 False
56 CastUInt32ToInt32Safe/262144/10 467.505m items/sec 469.887m
items/sec 0.509 False
21 CastInt64ToInt32Unsafe/32768/0 3.332b items/sec 3.343b
items/sec 0.332 False
13 CastInt64ToInt32Unsafe/262144/1 4.292b items/sec 4.300b
items/sec 0.195 False
9 CastInt64ToInt32Unsafe/32768/10 3.284b items/sec 3.290b
items/sec 0.178 False
20 CastInt64ToInt32Unsafe/32768/1 3.324b items/sec 3.328b
items/sec 0.125 False
28 CastInt64ToDoubleUnsafe/262144/10 2.507b items/sec 2.510b
items/sec 0.103 False
36 CastInt64ToInt32Unsafe/262144/1000 4.273b items/sec 4.274b
items/sec 0.037 False
68 CastInt64ToDoubleUnsafe/32768/1 2.125b items/sec 2.122b
items/sec -0.153 False
39 CastInt64ToDoubleUnsafe/32768/0 2.137b items/sec 2.132b
items/sec -0.208 False
19 CastInt64ToDoubleUnsafe/262144/2 2.511b items/sec 2.505b
items/sec -0.234 False
33 CastInt64ToInt32Unsafe/262144/10 4.288b items/sec 4.271b
items/sec -0.395 False
2 CastInt64ToDoubleUnsafe/32768/2 2.119b items/sec 2.110b
items/sec -0.455 False
58 CastInt64ToInt32Unsafe/262144/2 4.301b items/sec 4.277b
items/sec -0.549 False
48 CastInt64ToDoubleUnsafe/262144/1 2.545b items/sec 2.528b
items/sec -0.651 False
0 CastInt64ToDoubleUnsafe/262144/1000 2.525b items/sec 2.501b
items/sec -0.941 False
45 CastInt64ToDoubleUnsafe/262144/0 2.546b items/sec 2.518b
items/sec -1.098 False
30 CastInt64ToDoubleUnsafe/32768/10 2.131b items/sec 2.097b
items/sec -1.615 False
50 CastInt64ToDoubleUnsafe/32768/1000 2.135b items/sec 2.072b
items/sec -2.954 False
60 CastDoubleToInt32Safe/32768/0 934.302m items/sec 888.511m
items/sec -4.901 False
62 CastInt64ToDoubleSafe/32768/0 1.132b items/sec 1.073b
items/sec -5.285 True
35 CastDoubleToInt32Safe/262144/0 1.012b items/sec 951.534m
items/sec -5.960 True
17 CastInt64ToInt32Safe/32768/10 518.073m items/sec 485.375m
items/sec -6.311 True
37 CastInt64ToDoubleSafe/262144/0 1.229b items/sec 1.141b
items/sec -7.110 True
47 CastInt64ToDoubleSafe/262144/10 455.081m items/sec 418.319m
items/sec -8.078 True
16 CastDoubleToInt32Safe/32768/2 223.095m items/sec 202.291m
items/sec -9.325 True
23 CastDoubleToInt32Safe/262144/2 227.086m items/sec 203.714m
items/sec -10.292 True
59 CastDoubleToInt32Safe/32768/10 463.260m items/sec 389.040m
items/sec -16.021 True
41 CastDoubleToInt32Safe/262144/10 479.642m items/sec 401.058m
items/sec -16.384 True
32 CastInt64ToInt32Safe/262144/10 542.675m items/sec 442.477m
items/sec -18.464 True
4 CastInt64ToInt32Safe/32768/0 1.648b items/sec 1.316b
items/sec -20.173 True
42 CastInt64ToInt32Safe/262144/0 1.894b items/sec 1.444b
items/sec -23.787 True
65 CastDoubleToInt32Unsafe/32768/1000 2.954b items/sec 2.248b
items/sec -23.882 True
44 CastDoubleToInt32Unsafe/32768/10 2.955b items/sec 2.233b
items/sec -24.439 True
51 CastDoubleToInt32Unsafe/32768/0 2.916b items/sec 2.202b
items/sec -24.494 True
63 CastDoubleToInt32Unsafe/32768/1 2.962b items/sec 2.227b
items/sec -24.821 True
8 CastDoubleToInt32Unsafe/32768/2 2.974b items/sec 2.225b
items/sec -25.194 True
6 CastDoubleToInt32Unsafe/262144/2 3.759b items/sec 2.673b
items/sec -28.877 True
1 CastDoubleToInt32Unsafe/262144/1000 3.765b items/sec 2.671b
items/sec -29.063 True
34 CastDoubleToInt32Unsafe/262144/10 3.773b items/sec 2.649b
items/sec -29.802 True
11 CastDoubleToInt32Unsafe/262144/0 3.778b items/sec 2.641b
items/sec -30.089 True
27 CastDoubleToInt32Unsafe/262144/1 3.778b items/sec 2.578b
items/sec -31.763 True
29 CastUInt32ToInt32Safe/32768/0 2.307b items/sec 1.410b
items/sec -38.873 True
10 CastUInt32ToInt32Safe/262144/0 2.728b items/sec 1.521b
items/sec -44.266 True
```
In the case where there is a regression, the code went from "very very fast"
to "very fast" so not likely to make a difference in real world workloads.
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